Frame grabber for image processing in ingress/egress control system
First Claim
1. A frame grabber for use with a security system that employs:
- i) a video camera to observe movement of people into and out of a secure area, and ii) a video monitor to display video images from the camera;
the frame grabber comprising;
a converter converting video images from an analog to a digital format and recording the digitized images for subsequent use;
a means responsive to an alarm condition that occurs when a person attempts an unauthorized entry into the secure area to interrupt recording and commence a continuous-loop playback of the digitized images on the video monitor; and
, a control responsive to a command from a system operator to halt playback at any image in the continuous-loop to permit image scrutiny, the control further permitting the operator to move forward or backward within the loop to select the image to display.
2 Assignments
0 Petitions
Accused Products
Abstract
A frame grabber (10) used in a security system monitoring a secure area. The frame grabber converts video images from a camera (T) to a digital format and records the converted images (I). In response to an alarm which occurs when a person attempts an unauthorized entry into the secure area, the frame grabber automatically halts the recording and commences playback of previously recorded images. The playback comprises a continuous loop (L) of images which are displayed on a video monitor (M). An operator of the security system can halt the playback at any image in the loop so to attempt to identify the person. In determining which image to display, the operator can move both forward or backward through the loop.
24 Citations
22 Claims
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1. A frame grabber for use with a security system that employs:
- i) a video camera to observe movement of people into and out of a secure area, and ii) a video monitor to display video images from the camera;
the frame grabber comprising;
a converter converting video images from an analog to a digital format and recording the digitized images for subsequent use;
a means responsive to an alarm condition that occurs when a person attempts an unauthorized entry into the secure area to interrupt recording and commence a continuous-loop playback of the digitized images on the video monitor; and
,a control responsive to a command from a system operator to halt playback at any image in the continuous-loop to permit image scrutiny, the control further permitting the operator to move forward or backward within the loop to select the image to display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- i) a video camera to observe movement of people into and out of a secure area, and ii) a video monitor to display video images from the camera;
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9. A method of observing the movement of people into and out of a secure area to determine if someone attempts an unauthorized entry into the area comprising steps:
employing a video camera to observe movement of people into and out of the secure area and recording video images from the camera for subsequent use;
converting the video images from an analog to a digital format using a frame grabber, and recording the digitized images;
responding to an alarm condition which occurs when a person attempts an unauthorized entry into the area to interrupt the recording and commence playback of a continuous-loop of the recorded digitized images;
displaying the digitized images on a video monitor to permit image scrutiny; and
,halting the playback at any image in the loop of images, and moving forward or backward within the loop to display a particular image. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A frame grabber for use in a security system monitoring a secure area having a separate ingress and egress passages, the security system including i) a video camera observing movement of people through the egress passage, and ii) a video monitor to display video images from the camera, the frame grabber comprising:
a converter converting video images from an analog to a digital format and recording the digitized images for subsequent use;
a means responsive to an alarm condition that occurs when a person attempts an unauthorized entry into the secure area through the egress passage to automatically interrupt the recording and commence a continuous-loop playback of the digitized images on the video monitor; and
,a control responsive to a command from a system operator of the security system to halt playback at any image in the continuous-loop to permit image scrutiny, the control further permitting the operator to move forward or backward within the loop to select the image to display. - View Dependent Claims (18, 19, 20, 21, 22)
Specification